For example, a math teacher or department has 2 algebra and 2 geometry courses.
例如，数学老师或者数学系有2个代数课程和两个几何课程。
With a t square in his hand. the teacher of geometry came into the classroom.
几何老师手拿一把丁字尺，走进了教室。
With a t square in his hand. the teacher of geometry came into the classroom.
几何老师手拿一把丁字尺，走进了教室。
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